Production of vat coloring matters



Patented an. "r, was.

MAX ALBERT KUNZ, OF MANNHEIM, GERMANY, ASSIGNGR TO BADISUHE Al ILIH' Li; SODA FABRIK, F LUD'WIGSHAFEN-ON-THEJRHINE, G-EEIEAITZ, A. JUEYOEATIQN 0F GERMANY.

EBODUCTION OF VAT GOLDBERG MATTERS.

Narrowing.

T 0 all 10h 0m it may concern Be it known that 1. MAX ALBE KUNZ, citizen of Switzerland, residing at Mannheim, Germany, have invented new and use- I ful Improvements in the Production or". Vat Coloring Matters, of which the following is a .s ccification.

his invention relates to the production of new vat coloring mattersot' the benzanthrone series.

It has been fOlllKlillifltHQW derivatives of dihenzanthrone are produced by acting on dibenzanthrones with hydroxylamine which new derivatives dye valuable gray or black shades with a bluish tinge and an excellent fastness.

The invention is further illustrated by the following examples showing some .ways of effecting the reaction but the invention. is not limited thereto. The parts are by weight.

Eccample J.

100 parts of dibenzanthrone (see Patent 818,992) are dissolved, Whilst stirring, in 2000 parts of concentrated sulfuric acid of 66 degrees Baume'. After adding 39 parts of hydroxylamine sulfate the mixture is heated, within one and a half or two hours, to 165 degrees Centigrade and the temperature is kept for another three quarters of an hour at 165 degrees to 170 degrees centigrade. When cold, the solution is poured into Water, the precipitate is filtered oft" and washed with Water. 36

Example 2.

parts of dibenzanthrone are dissolved in 2000 parts'of sulfuric acid of otidegrees Baum, 42 parts of hydroxylamine ohlox hydrate and parts of copperas are then added and the whole is heated, for two hours, at degrees to degrees centigrade, Whilst stirring. The product is then Worked up as described in the foregoing example.

E sample 3.

Into a sol ution of 100 parts of dibenzanthrone in 2000 parts of suli'uric acid of 66 degrees Baum, 56 parts of hydroxylainine sulfate and 50 arts of copperas are introduoed Whilst stirrin The mixture is then Serial No. 606,266.

gradually heated, in the course of two hours, to 160 degrees centigrade and kept at this temperature for an additional hour. When cool, the product is Worked up as described in example 1.

The dyestuffs obtained according to either of the foregoing examples dye cotton from a violet-colored:hydrosulfite vat, violet shades which on Washing and exposing to the air be come bluish gray; or, when dyed with higher percentages, dark gray or even deep bluish black shades are produced.

The dyestuffs are practically insoluble in almost all organic solvents, even in those oi high boiling point; in boiling pyridine they are more easiiy soluble giving blue solu tions with an intensely red fluorescence. in concentrated sulfuric acid the dyestuffs dissolve with a violet color which turns more bluish on. addition of formaldehyde. The dyestuffs dissolved in sulfuric acid take up small amount of nitrous acid, the violet solution turning blue or bluish green. The dyestuii' isolated from this solution dyes cot- 75 ton with a' more bluish tinge. 7

instead of hydroaylaniine, electrolytically reduced nitric acid be employed.

1 claim:

1. a new article of manufacture, a vet coloring matter of dihenzanthrone series which dyes cotton from a violet hydrosuiiite vat bluish gray or, en enipioyed in h percentages, bluish ciao-i: of fastness, which pi duct practicaii in ubie most solvents but dissoi in boi pyridine With a blue color and an intensely red fluorescence and which, when. dissolved in sulfuric acid takes up a small amount of nitrous acid.

2. The process of manufacturing a new dyestufi of the dihenzanthrone group which consists in causing hydroxyiamine to react with a dibenzanthrone body.

3. The orocess of manufacturing a new e dyestutf or the dihenzanthrone group which consists in heatingdibenzanthrone, in the presence of concentrated sulfuric acid, with hydroxylainine sulfate.

in testimony whereof i have hereunto Sell ice in hand.

y MAX ALBERT RUN 

